Hose coupling and method of securing the same to a hose



Dec. 25, 1934. D. B. GISH 1,985,494

I HOSE COUPLING AND METHOD OF SECURING THE SAME TO A HOSE Filed Sept. 12, 1954 Patented Dec. 25, 1934 1,985,494

UNITED STATES PATENT men;

' HOSE COUPLING AND METHOD OF SECURING THE SAME TO A HOSE mum a. can; sprmrneia, Mass. Application September 12, 1934, Serial No. 743,688

' 4 Claims. (Cl. 285-84) This invention relates to improvements in hose hose H may be of the usual high-pressure concouplings and is directed more particularly to struction such as is commonly used in conimprovements in couplings for high-pressure hose nection with lubricating apparatus. One form of and the method of securing the same to a hose. such a hose is a combination of a tubular body 5 The principal objects of the invention are 6.1- of rubber or other plastic material and a rein- 5 rected to the provision of a novel coupling and forcement in the walls of the body which may be method of securing the same to a hose in such formed by windings or braidings of wires india way that the hose and coupling are firmly held cated generally by 14. in secured-together relation and are adapted to The endmost and outer. or covering, portion withstand high pressures and facilitate manipulaof the hose is ground off or scarfed as at 16 as. 10 tion of the hose without liability of rupture at, or shown to provide a uniform diameter that will near, the coupling. fit withinthe skirt in a proper manner and this According to special features of the invenscarflng in most cases forms a shoulder such as tion, a hose is fitted into a compressible coupling 1'7. The said end of the hose when ground or of novel form and the coupling is compressed by scarfed may be slipped into the coupling C with 15 means of hydraulic pressure to deform the couthe tail piece 4 inserted in the bore 5 of the hose pling so that it is attached to the hose in a-secure while the endmost portion of he hOSe abuts manner, all as will hereinafter appear. the surface or end 11 of the groove 10, the wall Various other novel objects and advantages of of the hose being between the tail-piece and wall 20 the invention will hereinafter appear from the of the coupling. 20

following description of the present preferred T h is rf to r m ve irre ularities on form of the invention, reference being had to the its outer su as Well as to p id a u i orm accompanying drawing, whereini outer diameter so that when the hose is slipped Fig. 1 is a sectional elevational view of a couinto the coupling i f h pace be ween the 26 pling embodying certain novel features f the tail piece and skirt with the shoulder 17 thereof invention; concealed within the recess 12.

Fig. 2 is a side elevational view of the end por- A bushing 13 is Provided which y be l a t of a hose partly in ti t which t rate from the tail piece. This is preferably bored coupling, shown in Fig. 1, is secured; out as shown for fitting over the tail piece 4 and 30 F 3 is partial sectional t1 1 view is preferably formed to have projections or barbs 30 of the'couphng of Fig 1 and hose of Fig 2 shown 20 and grooves 22. The projections and grooves in secured-together relation; may be m d in va ious Ways and, f desired, Fig. 4 is an elevational view of a bushing of the the said bushing may be split as a 4 o h t it invention; may be made to fit tightly on the tail-piece. In

36 Fig 5 is m view of t same, and another way, a coupling 50 such as shown in 6 is view imilar to Fig, 1 showing a Fig. 6 may have a skirt 52 and tail-piece 54 with modified form of the coupling of the invention. P i t nS 8 and 56 associated with Referring now to the drawing more in detail, the tall'plecet invention W111 be fully described The inner bore of the hose at its endmost part A coupling is represented by C which is formed is preferably enlarged as at 26 as by removing 40 to have a, taibmece 4 and a skirt or wan The the material of the hose. 11115 is to more or less tampiece and wall are preferably integral The expose the reinforcement of the hose and provide tampiece 4 has an opening 6 therethrough and an enlarged bore for receiving the bushing or the projections and grooves. a groove 10 1s formed between the tail-piece 4 In assembling the hose and coupling, the end and skirt 8 by the spacing apart thereof.

The lower end of the skirt 8 is preferably bored g g gf gfif f i gg ia gg 3 5835225 3:552 out as at 12 to provide arecess or inner diameter the taibpiece 4, the end of the hose preferably Whlch 1S Shghuy greater than that 01 the main bottoming in the groove between the tail-piece 4 body of the said skirtthereabove. The outer diand skirt or wall 3 of th coupling and t t 50 m er f he a l-p 4 0f h p in is shoulder 1'1 of the hose ,well up in the recess 12 pref ra y u h th i will fi W th an Opening at the lower end of the coupling. With the hose 5 of the hose now to be described. and coupling assembled as described the coupling An end portion of a hose is represented at H is then secured to the hose by pressing the skirt in Fig. 2 which, as usual. has a bore 5. The inwardly in a certain way. 55

The pressing is accomplished according to the invention by hydraulic pressure and vis done by placing the coupling between suitable dies which are actuated by hydraulic pressure. The dies are so arranged that when pressure is applied to the coupling it is deformed or compressed as shown in Fig. 3.

That is, the skirt of the coupling is pressed inwardly to decrease its diameter, whereby one part is of a different diameter than another part to produce different effects. For instance, the coupling at a point indicated by 30 is reduced in diameter so as to compress the end portion of the hose and force the reinforcing wires 14 into the grooves 22 of the bushing 18 whereby the wires, grooves and projections are interlocked so that the end of the hose is locked securely in the coupling.

Just below and at a point indicated by 32 the coupling is reduced in diameter to a greater extent than at point 30 to form a more or less of a shoulder part 34 which holds the bushing 18, interlocked with the reinforcement 14, from being pulled downwardly of the coupling. Where the bushing is slotted as shown, it will firmly grip the tail piece since it is adapted to be compressed although the slotting may not be necessary in all cases as it will be bound more or less to the tailpiece.

A part of the skirt indicated at 36 is compressed less than the part above it to relieve the hose somewhat of pressure near the lower end of the coupling. This is so the hose will not be ruptured and may bend more or less at this point without injury when the hose is in use.

It is a special feature of the invention that the coupling is compressed by means of hydraulic or fluid pressure as distinguished by operations performed by a power press or where a coupling member is drawn, swedged or rolled onto a. hose.

In the fitting of hose to a tubular member by the usual grinding of the hose, it will be at once apparent that it is difficult to provide any great number of couplings with exactly similar internal diameters or to scarf any great number of pieces of hose so that they have the same external diameters. Therefore, with a number of hose lengths and couplings having varying diameters, the couplings can not be secured to the hose in a uniformly satisfactory manner by the use of a power press, by drawing, swedging, rolling, or similar operations.

This is for the obvious reason that in all such operations, the coupling must be and is pressed to certain fixed diameters. Since the two elements to be joined are of varying diameters to' begin with, the results are necessarily non-uniform when the coupling is pressed to certain diameters. It is, of course, desirable for best results that the coupling be secured to the hose uniformly.

By the use of hydraulic pressure, it is possible to use a certain predetermined pressure for compressing the coupling and then regardless of the individual variations mentioned, there will be uniformity in the finished product. That is to say, the compression on the couplings will be uniform so that the securing is uniform. A

The apparatus for hydraulically compressing the coupling may take some well-known form and it will sufiice to say that the coupling is compressed or reduced in diameter at one or more points as described by means of hydraulic pressure.

The method described provides a positive lock for the hose and coupling and is very desirable in that it obviates the possibility that the hose might become loose from or detached from the coupling when strains are applied to the hose while the hose is not ruptured at the end of the coupling and may bend at this point without rupture. The features of the invention are particularly adapted for high-pressure service in connection with greasing apparatus where the hose is necessarily subjected to severe strains and is called upon to support apparatus such as grease guns or the like. The necessity for a secure attachment of hose and coupling is therefore obviously necessary and is accomplished by means of the invention.

While I have described the invention in great detail and with respect to a preferred form thereof, it is not desired to be'limited thereto since many changes and modifications may be made therein without departing from the spirit and scope of the invention. What it is desired to claim and secure by Letters Patent of the United States is:

1. A combined hose and coupling, the said hose having reinforcement in the wall thereof with the inner portion of the wall removed adjacent the end of the hose to provide an enlarged bore, the said coupling including a tail-piece within the bore of the hose and interlocking means for the reinforcement within the bore of the hose at its end and a skirt surrounding the hose which is compressed to squeeze the wall of the hose between it and said tail-piece, the said interlocking means including a bushing on said tail-piece having grooves and projections.

2. The combination of a hose having a reinforced wall with a portion of its inner wall removed at the end of its bore to substantially expose the reinforcement and a coupling comprising, a tail-piece extending into the bore of the hose and having interlocking means associated therewith including recesses and projections adapted to contact said exposed reinforcement, and a skirt connected at its upper end to the upper end of the tail-piece which when compressed around said hose forces the exposed part of said reinforcement into intimate engagement with said recesses of said tail piece and squeezes the wall of said hose between the skirt and tailpiece.

3. The combination of a hose having a reinforced wall with a portion of its inner wall removed at the end of its bore to substantially expose the reinforcement to provide an enlarged end bore and a coupling comprising, a tail-piece extending into the bore of thehose and having interlocking means associated therewith including recesses and projections adjacent the said reinforcement of greater over-all diameter than that of the tail-piece therebelow, and a skirt connected at its upper end to the upper end of the tail-piece which when compressed around said hose with a consequent reduction in diameter squeezes the wall of the hose between the skirt and tail-piece to lock the reinforcement, recesses and projections, the compression being such that a zone of least diameter is formed immediately beyond that portion of the tail-piece having the greatest diameter.

4. A coupling for a hose comprising in combination, a central tail-piece and an outer annular wall rigidly connected at their upper ends, interlocking means at the upper end of the tail-piece coupling which is of relative greater width below the bushing than around said bushing whereby a hose having the end portion or its bore enlarged may be inserted in said groove with the interlock ing means in the said enlarged bore of the hose.

DANIEL B. GISH. 

